Ice
Ice, ., is formed when a pool is frozen by a spell, wand of cold, frost horn, or breath attack. It is slippery, and when you are walking on it, you may fumble, unless you are wearing snow boots or are naturally cold resistant (e.g. a valkyrie or polymorphed into a winter wolf). Note that cold resistance gained from eating a corpse will not prevent this fumbling. The effect is the same as gauntlets of fumbling or fumble boots. (If snow boots are fumble boots, you will continue to suffer from the effects, but for a different reason).
Beware fire-breathing monsters, wands of fire, fire traps and such effects if you are on ice; those will melt it.
Corpses rot half as fast if they're on ice.
Items on ice will slide further when kicked, upon kicking them you get the message 'Whee! a\an\the item slides across the ice.'
Message generated from pools (not moats) being frozen into ice is "The water freezes" ("The water freezes for a moment" when attempting in vain to freeze water on the Plane of Water.)
